batgrbproduct Analysis for Trigger=353071
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.44
Process Start Time (local time): Tue May 26 00:08:28 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger353071/GCN5_download_cron
======================================================================
Trigger: 00353071 Segment: 000
BAT Trigger Time: 264943898.688 [s; MET]
Trigger Stop: 264943899.712 [s; MET]
UTC: 2009-05-25T11:31:33.917180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 278.226899545095 Dec: 30.4836471707074 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.6
Image Trigger?: NO
Rate S/N Ratio: 8.54400374531753 [ if not an image trigger ]
Image S/N Ratio: 5.6
Flight Position: [ source = BAT ]
RA: 278.226899545095 Dec: 30.4836471707074 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 278.359034384835 Dec: 30.5736100308547 [deg; J2000]
{ 18h 33m 26.2s , +30d 34' 25.0" }
+/- 4.01662079332472 [arcmin] (estimated 90% radius based on SNR)
+/- 2.35581304276866 [arcmin] (formal 1-sigma fit error)
SNR: 4.17311207308946
Angular difference between Flight and Ground position is 8.704712 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 1.02400001883507 +/- 0.00565686571343518
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
T50: 1.02400001883507 +/- 0.00400000810623169
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02400001883507 second)
Measured from: -1.49011611938477e-08
to: 1.02400000393391 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.006670 0.006615 0.013470 0.018871
0.005833 0.006013 0.005558 0.005534 [error]
Peak -0.006670 0.006615 0.013470 0.018871
0.005833 0.006013 0.005558 0.005534 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.85e-10 1.32e-09 8.36e-09 2.68e-07 2.91e-08 2.77e-07 erg/cm2
Error 4.98e-10 1.85e-09 6.81e-09 3.61e-07 2.03e-08 3.64e-07 erg/cm2
Peak flux Power-law 5.57e-03 2.10e-02 6.63e-02 6.79e-01 1.86e-01 7.72e-01 ph/cm2/s
Error 1.53e-02 3.04e-02 5.51e-02 7.46e-01 1.49e-01 7.25e-01 ph/cm2/s
Fluence Cutoff-PL 9.34e-11 1.12e-09 9.23e-09 1.06e-07 2.96e-08 1.16e-07 erg/cm2
Error 4.89e-10 1.85e-09 8.07e-09 3.93e-07 1.47e-08 3.96e-07 erg/cm2
Peak flux Cutoff-PL 2.53e-03 1.68e-02 7.35e-02 3.24e-01 1.86e-01 4.19e-01 ph/cm2/s
Error 1.48e-02 3.00e-02 5.56e-02 9.47e-01 1.47e-01 1.26e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.649 1.500 - - 1.02e-03 1.13e-03 52.730 57
CPL -2.130 0.000 242.7 0.0 2.29e-03 0.00e+00 52.580 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.649 1.500 - - 1.02e-03 1.13e-03 52.730 57
CPL -2.130 0.000 242.7 0.0 2.29e-03 0.00e+00 52.580 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.128000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
278.3590 +30.5736 0.0463 12.5 51.2 0.0471 4.2 TRIG_00353071
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.688 -10.688 (delta_t = 50.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.649451 ( -1.85459 1.14481 )
Norm@50keV : 1.02066E-03 ( -0.00102031 0.00123009 )
------------------------------------------------------------
# Chi-Squared = 52.73 using 59 PHA bins.
# Reduced chi-squared = 0.9250 for 57 degrees of freedom
# Null hypothesis probability = 6.360534e-01
Photon flux (15-150 keV) in 1.024 sec: 0.186060 ( -0.18606 0.11118 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91406e-08 ( -2.61707e-08 1.44345e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.12971 ( )
Epeak [keV] : 242.747 ( )
Norm@50keV : 2.29231E-03 ( )
------------------------------------------------------------
# Chi-Squared = 52.58 using 59 PHA bins.
# Reduced chi-squared = 0.9389 for 56 degrees of freedom
# Null hypothesis probability = 6.051816e-01
Photon flux (15-150 keV) in 1.024 sec: 0.186081 ( -0.186081 0.107205 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95875e-08 ( -1.469e-08 1.47858e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.99136 ( 0.020617 0.020617 )
beta : 0.125323 ( -0.239263 2.1923 )
Epeak [keV] : 131.450 ( -128.714 841.469 )
Norm@50keV : 9.95864E-03 ( -0.0113477 0.128181 )
------------------------------------------------------------
# Chi-Squared = 52.45 using 59 PHA bins.
# Reduced chi-squared = 0.9537 for 55 degrees of freedom
# Null hypothesis probability = 5.725694e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.649451 ( -1.85459 1.14481 )
Norm@50keV : 1.02066E-03 ( -0.00102031 0.00123009 )
------------------------------------------------------------
# Chi-Squared = 52.73 using 59 PHA bins.
# Reduced chi-squared = 0.9250 for 57 degrees of freedom
# Null hypothesis probability = 6.360534e-01
Photon flux (15-150 keV) in 1.024 sec: 0.186060 ( -0.18606 0.11118 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91406e-08 ( -2.61707e-08 1.44345e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.12971 ( )
Epeak [keV] : 242.747 ( )
Norm@50keV : 2.29231E-03 ( )
------------------------------------------------------------
# Chi-Squared = 52.58 using 59 PHA bins.
# Reduced chi-squared = 0.9389 for 56 degrees of freedom
# Null hypothesis probability = 6.051816e-01
Photon flux (15-150 keV) in 1.024 sec: 0.186081 ( -0.186081 0.107205 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95875e-08 ( -1.469e-08 1.47858e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.99136 ( 0.020617 0.020617 )
beta : 0.125323 ( -0.239263 2.1923 )
Epeak [keV] : 131.450 ( -128.714 841.469 )
Norm@50keV : 9.95864E-03 ( -0.0113477 0.128181 )
------------------------------------------------------------
# Chi-Squared = 52.45 using 59 PHA bins.
# Reduced chi-squared = 0.9537 for 55 degrees of freedom
# Null hypothesis probability = 5.725694e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue May 26 00:17:35 EDT 2009